The Use of 3D Modeling for the Prediction of the Seismic Demands on the Gravity Dams

Date

2017-02-01

Author

Bybordıanı, Mılad
Arıcı, Yalın

Metadata

Show full item record

Item Usage Stats

150
views

0
downloads

Seismic behavior of gravity dams has long been evaluated using a representative 2D monolith for the system. Formulated for the gravity dams built in wide-canyons, the assumption is nevertheless utilized extensively for almost all concrete dams due to the established procedures as well as the expected computational costs of a three dimensional model. However, a significant number of RCC dams, characterized as such systems, do not conform to the basic assumptions of these methods by violating the conditions on canyon dimensions and joint-spacing/ details. Based on the premise that the 2D modeling assumption is overstretched for practical purposes in a variety of settings, the purpose of this study is to critically evaluate the use of 2D modeling for the prediction of the seismic demands on these systems. Using a robust SSI approach, the difference between the 2 and 3D response for gravity dams are investigated first in the frequency domain. Rigorous frequency domain solutions for both cases were used in order to compare the frequency response functions for the crest response quantities. In the 3D configuration, monolithic models with no construction joints as well as models composed of independent monoliths were used as the two ideal cases in order to investigate the behavior of the 3D model. The effect of the narrowness of the canyon as well as the foundation rigidity was evaluated for a range of canyon widths and foundation moduli and the differences between the natural frequencies and the damping ratios between the two modeling approaches were presented. As the engineering decision parameters on such systems are based on time domain parameters such as the stresses and displacements, next, a time domain comparison between the responses of 2 and 3D models were obtained using 70 different ground motions. The maximum crest displacement and toe stress values for the 2 and 3D models were compared for different canyon widths and foundation moduli. The scatter of the differences between the 2 and 3D model results were presented for different ground motions in order to show the possible bias introduced into the analysis results due to the modeling approach. The results of the study show that even for relatively wide canyons, the 2D analysis can lead to misleading predictions.

URI

https://hdl.handle.net/11511/78055
https://invenio.itam.cas.cz/record/19192?ln=en

Conference Name

16th World Conference on Earthquake Engineering, (2017-01-09 / 2017-01-13)

Collections

Department of Civil Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

The use of 3D modeling for the prediction of the seismic demands on the gravity dams Bybordiani, M.; Arıcı, Yalın (2017-09-01) Seismic behavior of gravity dams has long been evaluated using a representative two-dimensional (2D) system. Formulated for the gravity dams built in wide canyons, the assumption is nevertheless utilized extensively for almost all concrete dams due to the established procedures as well as the expected computational costs of a three-dimensional model. However, a significant number of roller-compacted concrete dams, characterized as such systems, do not conform to the basic assumptions of these methods by vio...
Quantitative comparison of 2D and 3D modeling for concrete gravity dams Evliya, Ekin Erdem; Arıcı, Yalın; Department of Civil Engineering (2014) Seismic behavior of gravity dams has long been evaluated and predicted using a representative 2D monolith for the dam. Formulated for the gravity dams built in wide-canyons, the assumption is nevertheless utilized extensively for almost all concrete dams due to the established procedures in 2D space as well as the expected computational costs of building a three dimensional model. A significant number of roller compacted concrete dams are being designed based on these procedures regardless of the valley dim...
THE USE OF CONTINUOUS CENTRIFUGAL GRAVITY CONCENTRATION IN GRINDING CIRCUIT. MODIFIED APPROACH FOR IMPROVED METALLURGICAL PERFORMANCE AND REDUCED GRINDING REQUIREMENTS Altun, Naci Emre; Klein, Bern (2015-01-01) The use of centrifugal gravity concentration in the closed-grinding circuit of a gold-containing massive sulphide ore was tested on classifier underflow and overflow. A continuous Knelson CVD6 was retrofitted to the hydrocyclone underflow for recovery of Au and Pb at a coarser feed size. The objective of treatment of overflow was recovering unliberated Au prior to flotation. The tests were performed in actual operating conditions at Nyrstar's Myra Falls Mine. The results of the tests on the cyclone underflo...
An application of k-e model to oscillatory boundary layers Aydın, İsmail (1988-03-01) The k-ε model of turbulence is applied to one-dimensional oscillatory turbulent boundary layer flow. Computations are performed over fine meshes extending from the bottom to the outside of the boundary layer. Effects of low Reynolds number are included in the equations of turbulent kinetic energy and turbulent energy dissipation rate. An additional production of turbulent kinetic energy due to the surface roughness is simulated by introduction of a ‘roughness viscosity’ in the production term of turbulent k...
A Novel Two-Way Finite-Element Parabolic Equation Groundwave Propagation Tool: Tests With Canonical Structures and Calibration Apaydin, Gokhan; Ozgun, Ozlem; Kuzuoğlu, Mustafa; Sevgi, Levent (Institute of Electrical and Electronics Engineers (IEEE), 2011-08-01) A novel two-way finite-element parabolic equation (PE) (2W-FEMPE) propagation model which handles both forward and backward scattering effects of the groundwave propagation above the Earth's surface over irregular terrain paths through inhomogeneous atmosphere is introduced. A Matlab-based propagation tool for 2W-FEMPE is developed and tested against mathematical exact and asymptotic solutions as well as the recently introduced two-way split-step PE model through a canonical validation, verification, and ca...

Citation Formats

M. Bybordıanı and Y. Arıcı, “The Use of 3D Modeling for the Prediction of the Seismic Demands on the Gravity Dams,” presented at the 16th World Conference on Earthquake Engineering, (2017-01-09 / 2017-01-13), Santiago (CL), 2017, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/78055.